4E99

Human Serum Albumin Complex with Perfluorooctane Sulfonate Potassium

• PDB DOI: https://doi.org/10.2210/pdb4E99/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Komagataella pastoris
• Mutation(s): No 


• Deposited: 2012-03-20 Released: 2012-06-06 
• Deposition Author(s): Luo, Z.P., Shi, X.L., Huang, M.D.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.278 
• R-Value Work: 0.238 
• R-Value Observed: 0.240 

Starting Model: experimental

Literature

Structural evidence of perfluorooctane sulfonate transport by human serum albumin

Luo, Z.P., Shi, X.L., Hu, Q., Zhao, B., Huang, M.D.

(2012) Chem Res Toxicol 25: 990-992

• PubMed: 22482699 
• DOI: https://doi.org/10.1021/tx300112p
• Primary Citation of Related Structures:  
  4E99


• PubMed Abstract: 
  

  Perfluorooctane sulfonate (PFOS) is a man-made fluorosurfactant and globally persistent organic pollutant. PFOS is mainly distributed in blood with a long half-life for elimination. PFOS was found mainly bound to human serum albumin (HSA) in plasma, the most abundant protein in human blood plasma, which transports a variety of endogenous and exogenous ligands. However, the structural basis of such binding remains unclear. Here, we report the crystal structure of the HSA-PFOS complex and show that PFOS binds to HSA at a molar ratio of 2:1. In addition, PFOS binding renders the HSA structure more compact. Our results provide a structural mechanism to understand the retention of surfactants in human serum.

---

Organizational Affiliation: 

State Key laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 67.57 kDa 
• Atom Count: 4,436 
• Modelled Residue Count: 554 
• Deposited Residue Count: 585 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serum albumin	A	585	Homo sapiens	Mutation(s): 0  Gene Names: ALB
UniProt & NIH Common Fund Data Resources
Find proteins for P02768 (Homo sapiens) Explore P02768  Go to UniProtKB:  P02768
PHAROS:  P02768 GTEx:  ENSG00000163631

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
P8S	B [auth A], C [auth A]	heptadecafluoro-1-octanesulfonic acid C8 H F17 O3 S YFSUTJLHUFNCNZ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.278 
• R-Value Work: 0.238 
• R-Value Observed: 0.240 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.466	α = 90
b = 83.756	β = 103.5
c = 56.004	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
BALBES	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-06-06 
Deposition Author(s): Luo, Z.P., Shi, X.L., Huang, M.D.

Revision History  

• Version 1.0: 2012-06-06
  Type: Initial release
  
• Version 1.1: 2023-11-08
  Changes: Data collection, Database references, Derived calculations, Refinement description